Class: RDF::Literal::Integer

Inherits:
Decimal show all
Defined in:
lib/rdf/model/literal/integer.rb

Overview

An integer literal.

Examples:

Arithmetic with integer literals

RDF::Literal(40) + 2                    #=> RDF::Literal(42)
RDF::Literal(45) - 3                    #=> RDF::Literal(42)
RDF::Literal(6) * 7                     #=> RDF::Literal(42)
RDF::Literal(84) / 2                    #=> RDF::Literal(42)

See Also:

Since:

  • 0.2.1

Constant Summary collapse

DATATYPE =

Since:

  • 0.2.1

RDF::URI("http://www.w3.org/2001/XMLSchema#integer")
GRAMMAR =

Since:

  • 0.2.1

/^[\+\-]?\d+$/.freeze

Constants inherited from RDF::Literal

FALSE, TRUE, XSD_STRING, ZERO

Instance Attribute Summary

Attributes inherited from RDF::Literal

#datatype, #direction, #language

Instance Method Summary collapse

Methods inherited from Decimal

#ceil, #floor

Methods inherited from Numeric

#%, #*, #**, #+, #+@, #-, #-@, #/, #<=>, #==, #acos, #asin, #atan, #atan2, #ceil, #cos, #exp, #exp10, #floor, #log, #log10, #sin, #sqrt, #tan, #to_d, #to_f, #to_i, #to_r

Methods inherited from RDF::Literal

#<=>, #==, #compatible?, #comperable_datatype2?, #comperable_datatype?, #datatype?, datatype_map, datatyped_class, #direction?, #english?, #eql?, #escape, #freeze, #hash, #humanize, #inspect, #language?, #literal?, new, #object, #plain?, #simple?, #squish, #squish!, #valid?, #validate!, #value, #value_hash

Methods included from Term

#<=>, #==, #compatible?, #eql?, #term?, #terms, #to_base, #to_term

Methods included from Value

#anonymous?, #canonicalize, #constant?, #graph?, #inspect, #inspect!, #invalid?, #iri?, #list?, #literal?, #node?, #resource?, #start_with?, #statement?, #term?, #to_nquads, #to_ntriples, #to_rdf, #to_term, #type_error, #uri?, #valid?, #validate!, #variable?

Constructor Details

#initialize(value, datatype: nil, lexical: nil, **options) ⇒ Integer

Returns a new instance of Integer.

Parameters:

  • value (String, Integer, #to_i)
  • value (Object)
  • direction (Symbol) —

    (nil) Initial text direction.

  • language (Symbol) —

    (nil) Language is downcased to ensure proper matching

  • lexical (String) (defaults to: nil) —

    (nil) Supplied lexical representation of this literal, otherwise it comes from transforming ‘value` to a string form..

  • datatype (URI) (defaults to: nil) —

    (nil)

  • validate (Boolean) —

    (false)

  • canonicalize (Boolean) —

    (false)

Since:

  • 0.2.1



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# File 'lib/rdf/model/literal/integer.rb', line 21

def initialize(value, datatype: nil, lexical: nil, **options)
  @datatype = RDF::URI(datatype || self.class.const_get(:DATATYPE))
  @string   = lexical || (value if value.is_a?(String))
  @object   = case
  when value.is_a?(::Integer)   then value
    when value.respond_to?(:to_i) then value.to_i
    else 0
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class RDF::Literal

Instance Method Details

#abs ⇒ RDF::Literal

Returns the absolute value of ‘self`.

From the XQuery function [fn:abs](www.w3.org/TR/xpath-functions/#func-abs).

Returns:

See Also:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/integer.rb', line 86

def abs
  (n = to_i) && n > 0 ? self : self.class.new(n.abs)
end

#canonicalize! ⇒ RDF::Literal

Converts this literal into its canonical lexical representation.

Returns:

See Also:

Since:

  • 0.2.1



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# File 'lib/rdf/model/literal/integer.rb', line 36

def canonicalize!
  @string = @object.to_s if @object
  self
end

#even? ⇒ Boolean

Returns ‘true` if the value is even.

Returns:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/integer.rb', line 65

def even?
  to_i.even?
end

#nonzero? ⇒ Boolean

Returns ‘self` if the value is not zero, `nil` otherwise.

Returns:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/integer.rb', line 115

def nonzero?
  to_i.nonzero? ? self : nil
end

#odd? ⇒ Boolean

Returns ‘true` if the value is odd.

Returns:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/integer.rb', line 74

def odd?
  to_i.odd?
end

#pred ⇒ RDF::Literal

Returns the predecessor value of ‘self`.

Returns:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/integer.rb', line 46

def pred
  RDF::Literal(to_i.pred)
end

#round ⇒ RDF::Literal

Returns ‘self`.

From the XQuery function [fn:round](www.w3.org/TR/xpath-functions/#func-round).

Returns:

See Also:

Since:

  • 0.2.1



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# File 'lib/rdf/model/literal/integer.rb', line 97

def round
  self
end

#succ ⇒ RDF::Literal Also known as: next

Returns the successor value of ‘self`.

Returns:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/integer.rb', line 55

def succ
  RDF::Literal(to_i.succ)
end

#to_bn ⇒ OpenSSL::BN

Returns the value as an ‘OpenSSL::BN` instance.

Returns:

  • (OpenSSL::BN)

See Also:

Since:

  • 0.2.4



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# File 'lib/rdf/model/literal/integer.rb', line 133

def to_bn
  require 'openssl' unless defined?(OpenSSL::BN)
  OpenSSL::BN.new(to_s)
end

#to_s ⇒ String

Returns the value as a string.

Returns:

  • (String)

Since:

  • 0.2.1



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# File 'lib/rdf/model/literal/integer.rb', line 123

def to_s
  @string || @object.to_s
end

#zero? ⇒ Boolean

Returns ‘true` if the value is zero.

Returns:

Since:

  • 0.2.3



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# File 'lib/rdf/model/literal/integer.rb', line 106

def zero?
  to_i.zero?
end